Scaffolding device.



F. B. JOHNSTON SCAFFOLDING DEVICE. APPLICATION FILED SEPI- 4, 1913.

1,168,397, Patented Jan. 18, 1916.

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Application filed September 4, 1813. Serial No. 788,068.

To all whom it may concern Be it known that I, FRANK B. J OHNS'ION, a citizen of the United States, residing in Roselle Park, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Scaffolding Devices, of which the following is a specification.

This invention relates to scaffolding devices, and more particularly to improvements in scaffolding machines by which term is meant machines for raising and lowering scaffolds by means of cables. Hitherto scaffolding machines have been used in the erection of high buildings and the machines were supported by Outriggers. From the machines cables were suspended which supported the platform on which the work men operated by means of cross-beams, as is well-known. Various kinds of machines have been made and used, and the present improvements consist in certain advantageous features whereby quick action by the operatives results. For this purpose my invention consists in an improved scafiolding machine, comprising a frame, drums supported on the frame, and cables depending from said drums and attached to the ends of a cross-beam, each of said drums having gears, worm-gears engaging the drums and means for operating the worm-gears, all of which will be fully described hereinafter and finally pointed out in the claim.

In the accompanying drawing, Figure 1 is a plan view of a machine embodying the invention, Fig. 2 is a side view of the same, and Fig. 3 is an end view.

Similar reference numerals indicate corresponding parts throughout the several figures of the drawing.

Referring to the drawing, and more particularly to Fig. 1, a rectangular frame 10 supports three standards 11, 12 and 13, suitably secured to the frame by means of bolts let. These standards 11, 12 and 13 are provided with suitable bearings in which rests the shaft 15, extending from one end to the other of the frame 10. Shaft 15 is provided with a worm 16 secured to the shaft by a pin 17, and a second worm 19 is secured to the shaft by a pin 20. Thrust-bearings 21 and 22 are secured to the shaft by means of pins 23. To the shaft is also secured a sheave 25 having a suitable groove 26 for holding the operating rope 50 therein. The frame also supports pillow-blocks 27 secured to the frame-members by bolts 28, and pillow-blocks 29 secured to the frame by bolts 30. These blocks 27 and 29 support shafts 31 and 32, to which in turn are secured drums 33 and 3st, which are provided with worm-wheels 35 and 36 respectively, which engage the worms 16 and 18. The drums 33 and 3 1 are also' provided with flanges 38 and 39 to prevent the cable from passing off the drums.

Intermediate the frame, a central member 40 is provided to which a plate 41 having a curved portion 42 is attached, which portion 42 serves to guide the operating rope and hold it in position so as to enter the groove 26. A. second rope-guiding device 43 is provided, which also serves to guide the rope and hold it in position so as to always enter the groove 26, which rope-guiding device 43 is secured by bolts to the frame of the machine.

It will be observed that the two drums are arranged in a rectangular frame and in one direction, that is, transversely, and the shaft is at right angles thereto, that is, longitudinally of the frame, the shaft being provided with worms and the drums with gears intermeshing therewith, and a ropeholding device being intermediate the worms and drums, whereby on the single operation of the rope, the shaft having the worms is rotated, and thereby the drums are simultaneously rotated. By the improvement, a very simple unitary structure is produced, which may be readily transported from place to place, and does not get out of order. Since the cables at the end of a cross-beam are simultaneously raised and lowered, the sides of the scaffold always remain at the same level.

I have shown an embodiment of my invention, but it is clear that changes may be made therein without departing from the spirit of the invention, as defined in the appended claim.

I claim:

A scaffolding device, comprising a rectangular frame, shafts transversely thereof, drums on the shafts, worm-wheels on the drums, a worm-shaft extending longitudinally of the frame, Worms on the shaft, In testimony, that I claim the foregoing means for manually operatlng the shaft, and as my mvent on, lhaveslgned my name 1n a supportmg member arranged centrally of, presence of two SllbSCIlblIlg WItIlGSSQS.

the frame, intermediate the drnmgand hav- 7 V v FRANK B J 5 ing'rope-guiding means arranged in regis- I Witnesses: I tration with the means for rotating the JOHN MURTAGH, Worm-shaft. F. Hose.

Copies of this patent may be obtained tor five cents' each, by a qqyessing the Commissioner qf ratents,

- e e Washington,D.'G." 

